ASTM A812 HSLA Steel Flange Grade 80

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: ASTM A812 HSLA Steel Flange Grade 80 Sheet Product Information -:- For detailed product information, please contact sales. -: ASTM A812 HSLA Steel Flange Grade 80 Sheet Synonyms -:- For detailed product information, please contact sales. -:

ASTM A812 HSLA Steel Grade 80 Sheet Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A812 Grade 80 High-Strength Low-Alloy (HSLA) Steel Sheet** **ASTM A812 Grade 80** is a premium **high-strength, low-alloy steel sheet and strip** engineered for the most demanding **structural components where maximum strength-to-weight ratio is critical**. This grade delivers a **minimum yield strength of 80 ksi (550 MPa)**, positioning it at the upper tier of conventional HSLA sheet products. The steel achieves this exceptional strength through a sophisticated combination of **microalloying (niobium, vanadium, titanium), controlled rolling, and often advanced thermomechanical controlled processing (TMCP) or accelerated cooling**. It is designed for applications where reducing material thickness and weight directly translates to performance and efficiency gains, while maintaining sufficient formability and weldability for fabrication. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A812/A812M** - Standard Specification for High-Strength Low-Alloy Steel Sheet and Strip for Welded, Bolted, or Riveted Structural Components. * **Key Characteristic:** This specification covers steels where **mechanical properties are the primary requirement**, allowing producers flexibility in chemistry and processing to achieve the high strength levels of Grade 80. * **Governing Standards:** * **ASTM A941** - Terminology Relating to Steel. * **ASTM A370** - Standard Test Methods and Definitions for Mechanical Testing. * **Processing:** Often supplied in a condition resulting from **Thermomechanical Controlled Processing (TMCP)**, which refines the grain structure to achieve high strength and toughness without subsequent heat treatment. --- ## **Chemical Composition (Weight %, max unless range is specified)** The composition is proprietary and optimized by each producer to meet the Grade 80 mechanical properties. The following represents a typical microalloyed HSLA approach for this strength level. | Element | Typical Composition / Limit (%) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.12 - 0.18 | Carefully balanced to contribute to strength while managing weldability and formability. | | **Manganese (Mn)** | 1.40 - 1.80 | Primary solid solution strengthener; critical for achieving hardenability in TMCP. | | **Phosphorus (P)** | 0.025 max | Impurity, kept very low. | | **Sulfur (S)** | 0.010 max | **Very low** - Essential for good ductility and through-thickness properties in high-strength steel. | | **Silicon (Si)** | 0.15 - 0.50 | Deoxidizer and solid solution strengthener. | | **Columbium (Cb/Nb)** | 0.04 - 0.08 | **Key microalloy.** Provides potent grain refinement and precipitation strengthening via Nb(CN). | | **Vanadium (V)** | 0.05 - 0.10 | Provides additional precipitation strengthening through V(C,N). | | **Titanium (Ti)** | 0.005 - 0.025 | Used for grain refinement and sulfide shape control (improves ductility). | | **Aluminum (Al)** | 0.015 - 0.060 | Grain refining deoxidizer. | | **Nitrogen (N)** | Controlled | Optimized in relation to V and Ti. | **Note:** The exact "recipe" of microalloys (Nb, V, Ti) and the processing parameters are key intellectual property for steelmakers producing Grade 80. --- ## **Typical Physical & Mechanical Properties (Grade 80 Sheet)** Properties are for hot-rolled sheet/strip produced via controlled processing. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 620 - 795 MPa (90,000 - 115,000 psi) | | **Yield Strength (min)** | **550 MPa (80,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | 14% (Subject to thickness; higher for thinner gauges) | | **Yield-to-Tensile Ratio (max)** | Typically ≤ 0.90 | High but controlled to ensure some deformation before fracture. | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Density** | ~7.85 g/cm³ (0.284 lb/in³) | | **Formability** | **Limited but manageable.** Suitable for simple bending and straight forming. Minimum bend radius is typically **3-4 times material thickness** perpendicular to the rolling direction. | | **Brinell Hardness (typical)** | 220 - 280 HBW | --- ## **Product Applications** ASTM A812 Grade 80 is specified for ultra-high-strength components where minimizing weight is paramount, often in safety-critical or performance-driven structures. **Primary Industries and Products:** 1. **Advanced Transportation & Mobility:** * **Critical Frame Members** and **Roll-Over Protective Structures (ROPS/FOPS)** for advanced agricultural and construction machinery. * **Chassis Components** for high-performance specialty vehicles, military vehicles, and racing applications. * **Longitudinal Rails** and **crossmembers** in next-generation heavy trucks for weight reduction and payload increase. 2. **Lifting & Material Handling:** * **Boom Sections** and **jibs** for high-capacity mobile cranes. * **Masts** and **fork arms** for high-lift, high-capacity forklifts. * **Components for advanced automated storage and retrieval systems (AS/RS).** 3. **Energy & Heavy Industry:** * **Lightweight structural supports** in oil & gas equipment. * **Components for renewable energy installations** (e.g., wind turbine internal structures, mounting frames). * **Guarding** and **bracing** for high-stress industrial environments. 4. **Security & Defense:** * **Armor backing plates** and **structural elements** in armored vehicles (as part of a composite system). * **Security paneling** and **blast-resistant module frames**. --- ## **Advantages and Critical Fabrication Considerations** * **Advantages:** * **Exceptional Strength-to-Weight Ratio:** 80 ksi yield strength enables radical weight savings and performance enhancements. * **Good Toughness:** TMCP processing typically provides better toughness than expected for its strength level. * **Eliminates Heat Treatment:** Delivers high strength in the as-delivered condition, saving cost and distortion issues. * **Critical Fabrication Considerations:** * **Forming Challenges:** **High springback** and **limited ductility** require careful tooling design and process control. **Hot forming** may be necessary for complex shapes. * **Stringent Welding Requirements:** **Ultra-low hydrogen welding practices are mandatory.** Use of preheat (often 200°F / 95°C minimum) is standard. Welding Procedure Specifications (WPS) must be rigorously qualified. * **Filler Metal Selection:** Must use high-strength, tough consumables (e.g., AWS E11018, ER110S-G). **Undermatching weld metal strength is sometimes acceptable and can improve joint toughness.** * **Thermal Cutting:** Plasma or laser cutting is preferred. Oxy-fuel cutting requires strict preheat to avoid hydrogen cracking and hard edges. * **Damage Sensitivity:** Notches and sharp surface defects are more critical than in lower-strength steels and can initiate cracks under lower stresses. Careful handling is required. * **Galvanizing Consideration:** Hot-dip galvanizing after fabrication may cause a loss of strength due to the thermal exposure; verification testing is essential. **In summary, ASTM A812 Grade 80 represents the forefront of as-rolled HSLA sheet technology, offering an 80 ksi minimum yield strength for extreme weight-reduction applications. It is a material for specialized engineering, demanding sophisticated design, precise fabrication techniques, and a thorough understanding of its behavior under forming and welding to fully harness its significant performance advantages.** -:- For detailed product information, please contact sales. -: ASTM A812 HSLA Steel Grade 80 Sheet Specification Dimensions Size： Diameter 20-1000 mm Length <4544 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: ASTM A812 HSLA Steel Grade 80 Sheet Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A812 HSLA Steel Flange Grade 80 Sheet -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A812 HSLA Steel Flange Grade 80 Sheet -:- For detailed product information, please contact sales. -:

Packing of ASTM A812 HSLA Steel Flange Grade 80 Sheet -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Flange drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1015 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition